The mirrors start out from
Schott Supremax 33 borosilicate (precision annealed) blanks. They are places in Strasbaugh grinding/polishing machines. Each machine pictured
can hold up to a 28" mirror and another machine that I have (not
pictured can hold up to a 32" mirror).

Zonal readings are made in a
test tunnel. As the mirror approaches completion, alternating
Coudé masks with overlapping zonal coverage are used. When the
mirror has been figured to the laboratory threshold, it goes
outside for star testing.
Now the mirror's telescopic figure can
be monitored, documented, and adjusted if necessary.

Getting ready to star-test a
24-inch mirror (below).
Aluminum telescope and integrated
platform built by Tom Osypowski of Equatorial Platforms.

I have an adjustable telescope to star-test and demonstrate
mirrors up to 32 inches.
You are welcome to come to my shop and inspect your mirror before it is
coated.